No 'Poo

How many hair products do you use? Shampoo, conditioner, gel, mousse, wax, hairspray? It might take ages, and cost a fair chunk, but the end look is worth it, right? Your hair is shiny and light. It looks like there is a perpetual wind flowing your long tresses back. When you step out of the shower, it is a Dove commercial.
But what did cavemen use before Dove Damage Therapy Daily Moisture? Did they just walk around with greasy scalps and dirty locks as they hunted dinosaurs? For that matter, what did people in the past century use? Modern shampooing only emerged in the 1930s.